Scale mechanism



Jun 24, 1930.

T. JOHNSON SCALE MECHANI SM Filed Aug. 4, 1926 in Hmww wmmo Patented June 24, .1930

PATENT OFFECE LEONARD '1. JOHNSON, OF NEW'ARK, NEW JERSEY SCALE MECHANISM Application filed August 4, 1926. Serial No. 127,069.

This invention relates to scale mechanism, and has for its object the provision of a scale which is simple in structure, economical of manufacture, and eflicient and accurate in operation.

A further object of the invention is to provide thermostatic compensation means of extreme simplicity for maintaining accuratereadingthroughout changes of atmospheric and weather conditions.

- "A further object of the invention is to provide a thermostat for a two-spring scale structure with means of mounting the same in the scale assembly.

A further object of the invention will appear more fully hereinafter. The invention consists substantially in the combination, construction, location, and relative arrangement ofparts, all as will be more fully hereinafter set forth, as shown in the accompanying drawing, and finally pointed out in the appended claims.

Referring to the drawings,

Fig. 1 is a view in side elevation and verticalcross section. illustrating a scale embodying my invention.

Fig. 2 is a view in front elevation of a slightly modified form of scale, i. e.,. a double spring type.

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2 and looking in the direction of the arrows, showing the application of the thermostat of my invention to this type of spring structure.

Fig. 4 is a detailed view of the thermostat employed in accordance with my invention.

The same part is designated by the same reference character wherever it occurs throughout the several views.

In weighing mechanism such as scales of 'the'cylinder type, it is customary to employ a thermostat to compensate for variations in temperature conditions, and many arrangements have beenproposed for effecting compensation by a thermostatic means.

For example, in my prior Patent No. 1,483,- 888," granted February 19, 1924, I have shown one simple arrangement for efiecting compensationofadjustment due to vari- 5 ationjin temperature conditions. It is among the special purposes of my present invention to provide a thermostat device for effecting compensation for temperature variation, which has for its chief merit, its extreme simplicity, minimum of parts, and ease of zero adjustment. In fact, in accord ance with my present invention, the only part used for thermostatic adjustment is the thermostat itself, thus permitting the elimination of all links, levers, and connecting rods ordinarily and heretofore employed.

Referring to Fig. 1 of the drawing, in which one embodiment of my invention illustrated refers, character 1 designates the base of a standard type of scale having the usual hollow post 2 resting thereon. Weighing lever 3 is located within the base, and is fulcrumed, as at 4 near the front end thereof. The platter 5 is provided with a portion 6, which extends through an orifice 7 in the top of the base 1, and is pivotally supported as at .8, by the lever 3.

The portion 6 is provided with the usual check rod 9, which extends horizontally in the base 1 and upwardly in the post 2, as

shown, and by means of a link connection 10 is secured to the front of the post 2 as at 11. The rear end-of the lever 3 is pro vided with a pivot 12-,- around which is hooked the supporting end or hook 13 of the spring 15, the other end of which is connected to one end of a rod 16, preferably supported by means of a ball and socket support 17 by one arm 18 of the bell crank lever pivotally carried at 19 by the front of the post 2. The other arm 20 of the bell crank lever 18 bearsagainst one end of a set screw 21, access to which is. afforded through the front of the post 2, so that the tension of the spring 15 may be varied within .the limits of movement of the set screw 21 for zero adjustment of the scale.- It will be readily appreciated that this constitutes an exceedingly simple means of securing zero adjustment of the scale under all conditions. J

The hook 18, in accordance with my invention, has secured thereto one end of the thermostat device 30, the other end of which "40 st ings is pivotally connected, as at 31, to one end of the actuating rod 32, carrying at the end thereof the usual rack teeth 33, which mesh with the gear wheel 34 which controls the Q 5 graduated scale cylinder 35, which rotates within the casing 36, supported at the top of thqfitst 2., will bosom frim'tho foregoing t in-colder weather the opting shortens and stiflens, which tends .to .raise m the rack rod 32, hut the gigrmostat device moves out fromitsfi position with rgsfiect to the hook 13, throwing tho-rackr further from the fulcrum, anddra-wing the rack rod down to maintain the male member at its zero position. It will be seen tram the foiegafmg, that I have provided (an exeeedingly simple, while at where the itself eonstitntesthe E stment. I*t willhkewise be seen that I "provided mgIy simple and vereadiustnient.

- n Figs. 2 end-3 I have shown my inven- 15 M ss appliedlp the double spring type ol solie, that is wherel two springs '15 and 15" are applied. Heretofore it has "been ad 0' le-springtype petment to fliwo e b efsede structure. -n.oeordanoe with-my invexgtiem-I um} todeso. To enable'me zit-device so Uo'the U9 oonmeet 'the i a-s bookie-:0! the spring K5, I provide a loop 40-, eom pl eteky mi-rounding ,both' springs, 3 and towhiohthe omemnost' ends oi the spin 15 und es-me anchored. Thespring essem led is 'supgurted by means of a. pivoted hook '41, iv jeh extends into a oollar same-she point oi fluncture the two I her-end of which 'is "votal ty oari iedbyie saddle 43 at one on of the dever 18 of the befl crank Ieverfllhe other and of 'whidh,-9Q2-, ie employed'for zero adi'gstment as previously desoribagl, It wiil seen fromthm construction fhat any movement imparted to the sprin by reason eta-change of the position of the thermostnt'is imparted to both springs.

it "is understood that two sp rin are emyloyed ordinarily, to promote eta flirty, and

ym'nornmloperutimg when one mg is placed mndera stretching tension, i other {spi in oontrao ts; @hismakes it ible to use e hsavier springs, whioh gwe longer li fie, and for-this reason ChB tWWBPMtyPB dam lis preferable to the :singte spring mimetic. V

1 n acoordame with any invention, it will @be seen'thatmhehsidjusting-ior zero reading,

. e0 ahwwhole loop ie adjusted withont changing the tensions! the springs. Therein/re easier adjustment is ermitte v and more -aeeu1rste adjustment' baine'dfi use the adjustment rs oormt throughout the male, as whereas in the-double spring typmoim 'neet' 'sisting out o heretofore employed, where adjustment is made by changing the position of the springs at the center of the spring assembly which has heretofore been necessitated, while such adjustment ma be accurate at the weight; adjustment 2( distor ion of theal' y the eame is insecure ltmflier 1 oithescale.

'iiectionswwoen said mues'and graduated member a and ions between suid mm and graduated inber device one end of aid spring f 8. s i 0, mm tion of a weight actuflied meansya rotfilbie drum having gmdumons themowm mok and gear mneqtioe betyemj said mews and M fimm imhfig a thermostat device and? a spring for resisti it of means saies ehermosm device waiting said j P" wilh slideonnefltions- 4. n a compensatingscale, tbe'oombination-ofl oasing, a 1- actuated deioef fi -a rotaMBle-drux'ma I structure torus mooement of device and non :betwoen said devise and drummieluding a thermostat uniting said spring and wm eowons for operating the drum to 1 15 maintain itfi n were position at air umpersj tum"- '1 a 5. In a compensating male, who oomhiw A tion of a casing, a actuated :derioo, a rotatable dmmymspmngetrudme for 10- no sistiug movement ofsai deviee and rik and our eonneotions hetwo'en aid devise and 1 mimcluding aehenmoatst'nniting said spring and :for operating the'drurn to maintainit airitemperetum. t 16. In a'e'omponsflting ieaieflthe tion with meanings weight unrated a rotatable drum, alsprrin mtruoture fonzra" f wbvioe, and

r zero), due to the Many Vmpdificatiom md changes of detaiis wifireadily occur to those skilled in joimngem otsaid-qideonnee-rim aotuis zero position at ifzs.

nections between said device and drum, of a thermostat uniting said spring and connections for operating the drum to maintain it in zero position at air temperature, and means for adjusting the position of the drum to a zero reading exteriorly of the casing.

7. In a compensating scale, the combination with a weight actuated mechanism including a pivoted-lever, a graduated memher, a spring for resisting the movement of said mechanism attached to one end of said lever and connections between said lever and graduated member of a thermostatic device in said connections, said thermostatic device being connected to said lever.

8. In a compensating scale, the combination with a weight actuated mechanism, a drum having scale graduations thereon, a spring for resisting movement of said mechanism and connections between said mechanism and drum of a zero adjusting means connected to the center of said spring.

9. In a compensating scale, the combination with a weight actuated mechanism, a drum having scale graduations thereon, a spring for resisting movement of said mechanism and connections between said mechanism and drum of a zero adjusting means connected to the center of said spring, and a thermostatic device in said connections.

10. In a compensating scale, the combination with a weight actuated mechanism, a drum having scale graduations thereon, a spring for resisting movement of said mechanism, a loop supporting both ends of said spring and attached to said mechanism, and connections between said drum and mechanism of an adjusting means attached to the center of said spring.

11. In a compensating scale, the combination with a weight actuated mechanism, a drum having scale graduations thereon, a spring for resisting movement of said mechanism, a loop supporting both ends-of said spring and attached to said mechanism, and connections between said drum and mechanism of an adjusting means attached to the center of said spring, and a thermostatic device in said connections.

' 12. In a compensating scale, the combination of a weight actuated lever, a graduated drum, means for rotating said drum, a thermostat comprising the sole connection between said means and one end of said lever, and means for adjusting the position of the end of said lever with respect to a portion of said means.

In testimony whereof I have hereunto set my hand on this 22nd day of July A. D.,

LEONARD T. JOHNSON. 

